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Message: <blockquote data-quote="Marky Dissod" data-source="post: 28517" data-attributes="member: 13218">Not sure if this is a separate problem, but ... first cold start of any day, soon as it goes into COLD closed loop, and until it reaches full operating temp,if the AC is on, my engine will threaten to / might shut off, no stumble or stutter.If it doesn't shut off, it'll 'idle' as low as 200RpM for up to 4 sec before the idle fixes back @ 625RpM (tuned), like the idle was trying to 'limbo'.No amount of tuning has had any permanent effect on this warmup symptom.Rarely this symptom shows up during off-/on-ramps; luckily I'm very talented at left-foot braking so I can artificially raise the idle with my right foot.I've tried 3 new Idle Air Control valves and two identical throttle bodies, no effect.Should I start a new thread about this, or could this be related?</blockquote>